Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ecc53ef0817082…

MALICIOUS

PDF

89.8 KB Created: 2021-08-08 21:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7159d82d73d7d43bf98bea14df54a970 SHA-1: 8b7368631bc25bc2456e9bf0bf62497d112e25f9 SHA-256: f1ecc53ef08170825810c8f0db6f6652f60031062a9b1906ba19ce75c28cb24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=how+to+scan+my+android+phone+for+virus+from+pc PDF link annotation
    • http://bitite.lv/media/txt/122/file/tizog.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b65bf87ec84---2458209664.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/10557152651.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/fevuzavetusozebibuwere.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/6kbtgtuu1l8nbfr0efl3jht70t/86890808514.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/183632845260b11b186dc16.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab14ba6b0---48882225662.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/95415316371.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/gerigerelagexokaveje.pdfIn PDF document text
    • https://birotex.rs/images/files/46634086553.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/50813746850.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/csd5etcp1ooe9cir20e7jrak42/rapavevo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/77596173928.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/juzufulozapij.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/2e9eck73jhe340is07fqb87lib/jakadanajunumifosawamiv.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/tovububagimelelekopuvabe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/10799237561.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/45108392568.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/34900592913.pdfIn PDF document text
    • http://boxethai38.com/upload/file/15288857083.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/63782594646.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/70161036976.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c013e6d---furodajija.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/gevudenodalimefuxovin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 17820 bytes
SHA-256: a375a56aac43c340053fc6a4e0d9daf232208308f245d176f11fdb316b5dcd72
font_01_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 11196 bytes
SHA-256: a2f7b768358eacbf041789f1689b8ba163d1bac94afaf6576e6877f32ee90f57

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